Credit when credit is due?

Over two months, Vodacom debited my account, at the same time that I made EFT's for the same amounts. I have tried constantly to get the amounts credited to my account, yet keep getting pushed from "Business" to "Personal" to Account Receivable, yet no one can sort out my credit. I sit on the phone for hours, only to be cut off. I get case numbers lodged, and a day later get an SMS to say the problem is sorted, yet they still have not credited my account. Vodacom is THE most inefficient company in the country to deal with. So much for customer care, they DO NOT CARE!